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x equals 4
-7 +2x = x + 8 2x - x = 7 + 8 x = 15
X=7
f(x) = 2x + 8 f(x) = -7 → 2x + 8 = -7 → 2x = -15 → x = -7½ = -7.5
2x2-1x-120 = (2x+15)(x-8) when factored